I don't know why no one will answer this question clearly, this is the third forum I've seen without it. There is a HIDDEN screw, even sneakier than the ones under the black square pieces - it's underneath a BLACK STICKER WITH TEXT ON IT, right on the bottom of the PS3, hiding in plain sight. You have to PEEL OFF THE BLACK STICKER to reveal another of those black plastic squares, which after removed will reveal the final screw. (caps for clarity)